RPC workload testing framework

[MariusVanDerWijden]

New command workload that does a bunch of queries e.g.

• make RPC calls
• do log search
• get blocks, headers, bodies, receipts, etc

[fjl]

What I had in mind here is a structure where we define tests for public networks and common things to do on them. The workload tests should support Sepolia and Mainnet.

Package internal/utesting can be used to implement the tests. We already use this for devp2p testing (see cmd/devp2p/internal/ethtest for example) and it works well.

[devlongs]

Hi @MariusVanDerWijden and @fjl,

I will like to contribute to this issue. My plan includes:

• Implementing a new workload command in cmd/workload/main.go
• Using internal/utesting to structure and execute tests
• Performing workload tests such as:
  • RPC connection verification
  • Fetching latest blocks, headers, and receipts
  • Retrieving logs from recent blocks

[fjl]

We have an initial version of the tool in now, so I'm considering this done.